Grain-thrashing concave and cylinder



Sept 27, 1927. 1,643,683

P. A. SHORB GRAIN THRASHING CONCAVE AND CYLINDER Filed Aug. 19, 1926 fig-i- 262 2 S26 S26 F- IA MM WWW I i Rh 264 I I 20 27 a 2 x 7 IN VENTOR Patented Sept. 27, 1927.

UNITED sTa'rs-s; orric-e.

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. x; is 1;: i .11 one: 1mm; .51 '3. 1'; GRAIN-THZRASHING CONCAVE AND CYLINDEil.

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s, 1 is afcro h view throu hja-e t nder, 'conc; I veyor as'sen ibly showing 'nyfim-proved cohzfl cave in position. Fig.2 is a we view of my improved concave with parts reni o vedior cl earness of Fig. 3 is a Front view "of afragmentary left h a'fidgportion fit my confcave. Fig. 4 is a View of the riglit l 'a1idenC1 of Fi '2. Fig. 5 is sectional view akenia1o ;th hire V V Fig. 2. Fi 6 is a hagmeataryfae ailt saw a preferred 1151 i of rib construction for my "concave.

M air numerals of reference indicate corresponding parts throughout all the figures of'the are iln gsp He fer i E iii:: 1. v 1w. .i 'u shown t customa'r thrashing cylin provi'c with a pluratity o't' teeth 51 h 11 spiked to its periphery The cylinderfl t) rotates on its axle 12 suitably housed inboarings not shown; Below the cylinder it is usually customary to set a plurality of concave plates spiked with teeth such as 15.

I show a forward concave plate 13 and a rear plate 14 so spiked at 1 5. However a centralconcave plate 18 is not spiked. The straw carried by the conveyor 16 is sucked through the passage between the cylinder 45 and the concaves 13, 18, 1 1. During this travel the teeth 11 beat the heads against teeth to knock the grain out. 0st thrashing separators include teeth on the central plate 18. It is here that my invention differs from customary practice.

have found that if the spikes are left ofi' the central concave plate that the interval of time of travel of the straw from plate 13 to plate 14 allows for some change in the position of the straw or so that the teeth on plate 14 serve to better remove remaining kernels that wou d e themes if plate is were spiked. i Accordingly I havestriveh m de- "s' etop a centre-1' plate 13 that will increase sit-plate 14 as welt-as serve help remove grain hereels themselves. A further function of {plate fromfthe side's towards the center 6f the cyl has; anda'lfso a) cause the "straw driven-by 'tfentri'fugal' iorc'e from the a "hater while assin plate 13 a) approaclrthe .cy l'- hitte a ate before striking the teeth .1 5 on plate 14. o This will be best: understood by e descri tion of the central plat-e18;

The eencave plate '18 iscast' wither-1d lags 1-9., 20'. 21. 22"an d side lugs Q's-and '24 andn25. The e-lags filed as'to'fit the shave intermediate side frame elements/of; the ma- Cll'lIlB Ilf-ld to s ace the plate 18 properly lie iweeh' plates 1'3 and 14.. Instead of having spikes on lfiy' pl'af 18,1 cast m plate with plurality of grooves alternatin' with ribs. I stead of the gi-o'ves being of constant depth throughout theyare formed deeper at the frontedge than elsewhereor so that they die out at the rear o'f the platefor so that the bacl'c edge of iny plate18' is of the depth 18 which is the depth of the casting and also .of the ribs; It will be noted that to cause the straw to travel towardsthe center of 'thelcylin passing from plate 13. to plate 14 and soas to cause the grain heads to change their line of travel, I cu'rve myefribs,v 26 towards the right and; my ribs 26jtothe left This is 'done by forming thesgrQQVGs 27 and 27 as curves approaching eachother.

18' is to change the lineof travel of the strawfaway In fact the central iribs. 26 -..;are formiel\l.-

shaped Fig. 2 since the ribs 26 and 26 Fig. 3 meet in a common point. The center of the plate rises as a ridge 26 as seen, while triangular ribs 26 and 26 are shown at the extreme sides.

As the teeth 11 carry the straw against the face of the ribs 26 these ribs 26 change the travel of the straw or tend to drag it towards the center. I find that if the teeth are made to roll or turn the straw somewhat in its travel that the kernels are more readily beaten out when attacked between teeth 11 and 15 on plate 14. Curving the ribs 26 and 26 causes this change in straw travel. I find that it the ribs are formed straighter as at 26 Fig. 6 and then curved more abruptly However the exact curvature is immaterial in the patentable features and 1 do not desire to be restricted to any particular form of rib.

The depth of the grooves 27 and 27* is a very material feature of my invention. These ribs are the deepest at the front edge or as seen in Figs. 3 and 5. and they taper out to nothing in depth at the rear or so as to leave an edge 18 which causes the straw to rise towards the cylinder 10 again against centrifugal force. The turning of the straw .and the change in directions previously mentioned all serve to improve the function of the teeth 11 and 15 on plate let to remove the grain. v

While I have shown the plate 18 formed as a concave element, it may be provided with a fiat face or a convex surface, in which case it would be used on the cylinder in lieu of teeth. plates would be spaced transversely at inter valsand bolted to the sides or ends of the cylinder. Also allof the concave might be built of plates 18. In combined harvesting operations for many years ribbed plates. have been employed as the concave unit while the cylinders are provided with a plurality of beater bars, arranged at spaced distances apart spanning between the ends of the cyl inder. Various means of attachment have been employed for these beater bars; in some cases an angle elementhas been used as a bed bar upon which the beater bar is bolted; in other cases the ribbed face of the beater bar was cast or made in the face of an angular plate, the bed bar or angular plate providing stifiness and fan suction to assist in drawing in the straw intermediate the concave and cylinder during thrashing operations and for ejecting the straw after the rubbing action. Generally such beater bars have been diagonally grooved and alternated to furnish a herringbone effect dur-' ing thrashing operations. In combined op erations I would preferably use in rasp cyl- For instance a plurality of such inder designs, a single concave plate 18, which however for convenience might be cast in transverse units. The beater bars would be grooved as illustrated with the grooves deepest at the face edge of the beater bar and dying out to zero depth at the rear thereof the above combination I believe would give maximum efficiency and rub out all of the grain from the straw ready for cleaning after being blown from the cylinder. Such other modifications may be employed as lie within the scope of the appended claims.

Having fully described my invention, What I now claim as new and desire to secure by Letters Patent is:

1. A plate of the class described havinga plurality of grooves and ribs in the face thereof; a ridge centrally positioned intermediate the ends of the plate, a rib on either side there-of meeting the ridge near the back edge of the plate, said pair of ribs being curved and spaced at a grooved distance from the forward edge of the ridge the remainder of the plate beyond the said ribs being grooved in curved manner specified to form an outer series of ribs of maximum depth at the front and of zero depth at the rear edge of the plate.

2. A plate of the class described having a ridge transversely formed intermediate its ends on the face portion thereof; the back edge of the plate being of constant and maximum thickness throughout; the forward edge presenting an alternating series of grooves and ribs each way from the central ridge element, the grooves being arcuate in form and of maximum depth at the forward edge of the plate and diminishing to zero depth at the rear edge of the plate; the ribs being spaced from the ridge element at desired intervals and curved rearwardly and towards the central ridge element substantially as specified.

POE A. SHORE.

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